"Katzen and Sack indicated to the undercover agent that they could resell the paintings overseas as part of the money-laundering scheme," said the U.S. Attorney for the District of Massachusetts, Michael J. Sullivan. The undercover sting investigation, apparently prompted by an informant's tip, was conducted by the U.S. Customs Service and the FBI.
The notion of intellectual property—the idea that artists’ works belong to them—dates at least to medieval Europe, though history records examples of the concept as early as ancient Greece. It had taken hold sufficiently during the Renaissance for Michelangelo to take umbrage when his work was misattributed. It was reported that when he discovered that another artist was receiving credit for sculpting the famous Pietà (now in St. Peter’s Basilica in Rome), Michelangelo returned with his chisel and added his signature across the centre of the sculpture, on the prominent sash across Mary’s upper body (in Italian): “Michelangelo Buonarroti, Florentine, made this.”